| 1 | /* Target-dependent code for Windows (including Cygwin) running on i386's, |
| 2 | for GDB. |
| 3 | |
| 4 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "osabi.h" |
| 23 | #include "i386-tdep.h" |
| 24 | #include "windows-tdep.h" |
| 25 | #include "regset.h" |
| 26 | #include "gdb_obstack.h" |
| 27 | #include "xml-support.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "inferior.h" |
| 30 | |
| 31 | /* Core file support. */ |
| 32 | |
| 33 | /* This vector maps GDB's idea of a register's number into an address |
| 34 | in the windows exception context vector. */ |
| 35 | |
| 36 | static int i386_windows_gregset_reg_offset[] = |
| 37 | { |
| 38 | 176, /* eax */ |
| 39 | 172, /* ecx */ |
| 40 | 168, /* edx */ |
| 41 | 164, /* ebx */ |
| 42 | |
| 43 | 196, /* esp */ |
| 44 | 180, /* ebp */ |
| 45 | 160, /* esi */ |
| 46 | 156, /* edi */ |
| 47 | |
| 48 | 184, /* eip */ |
| 49 | 192, /* eflags */ |
| 50 | 188, /* cs */ |
| 51 | 200, /* ss */ |
| 52 | |
| 53 | 152, /* ds */ |
| 54 | 148, /* es */ |
| 55 | 144, /* fs */ |
| 56 | 140, /* gs */ |
| 57 | |
| 58 | 56, /* FloatSave.RegisterArea[0 * 10] */ |
| 59 | 66, /* FloatSave.RegisterArea[1 * 10] */ |
| 60 | 76, /* FloatSave.RegisterArea[2 * 10] */ |
| 61 | 86, /* FloatSave.RegisterArea[3 * 10] */ |
| 62 | 96, /* FloatSave.RegisterArea[4 * 10] */ |
| 63 | 106, /* FloatSave.RegisterArea[5 * 10] */ |
| 64 | 116, /* FloatSave.RegisterArea[6 * 10] */ |
| 65 | 126, /* FloatSave.RegisterArea[7 * 10] */ |
| 66 | |
| 67 | 28, /* FloatSave.ControlWord */ |
| 68 | 32, /* FloatSave.StatusWord */ |
| 69 | 36, /* FloatSave.TagWord */ |
| 70 | 44, /* FloatSave.ErrorSelector */ |
| 71 | 40, /* FloatSave.ErrorOffset */ |
| 72 | 52, /* FloatSave.DataSelector */ |
| 73 | 48, /* FloatSave.DataOffset */ |
| 74 | 44, /* FloatSave.ErrorSelector */ |
| 75 | |
| 76 | /* XMM0-7 */ |
| 77 | 364, /* ExtendedRegisters[10*16] */ |
| 78 | 380, /* ExtendedRegisters[11*16] */ |
| 79 | 396, /* ExtendedRegisters[12*16] */ |
| 80 | 412, /* ExtendedRegisters[13*16] */ |
| 81 | 428, /* ExtendedRegisters[14*16] */ |
| 82 | 444, /* ExtendedRegisters[15*16] */ |
| 83 | 460, /* ExtendedRegisters[16*16] */ |
| 84 | 476, /* ExtendedRegisters[17*16] */ |
| 85 | |
| 86 | /* MXCSR */ |
| 87 | 228 /* ExtendedRegisters[24] */ |
| 88 | }; |
| 89 | |
| 90 | #define I386_WINDOWS_SIZEOF_GREGSET 716 |
| 91 | |
| 92 | static CORE_ADDR |
| 93 | i386_windows_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
| 94 | { |
| 95 | return i386_pe_skip_trampoline_code (frame, pc, NULL); |
| 96 | } |
| 97 | |
| 98 | static const char * |
| 99 | i386_windows_auto_wide_charset (void) |
| 100 | { |
| 101 | return "UTF-16"; |
| 102 | } |
| 103 | |
| 104 | /* Implement the "push_dummy_call" gdbarch method. */ |
| 105 | |
| 106 | static CORE_ADDR |
| 107 | i386_windows_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 108 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 109 | int nargs, struct value **args, CORE_ADDR sp, |
| 110 | function_call_return_method return_method, |
| 111 | CORE_ADDR struct_addr) |
| 112 | { |
| 113 | /* For non-static member functions of 32bit Windows programs, the thiscall |
| 114 | calling convention is used, so the 'this' pointer is passed in ECX. */ |
| 115 | bool thiscall = false; |
| 116 | |
| 117 | struct type *type = check_typedef (value_type (function)); |
| 118 | if (type->code () == TYPE_CODE_PTR) |
| 119 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 120 | |
| 121 | /* read_subroutine_type sets for non-static member functions the |
| 122 | artificial flag of the first parameter ('this' pointer). */ |
| 123 | if (type->code () == TYPE_CODE_METHOD |
| 124 | && type->num_fields () > 0 |
| 125 | && TYPE_FIELD_ARTIFICIAL (type, 0) |
| 126 | && type->field (0).type ()->code () == TYPE_CODE_PTR) |
| 127 | thiscall = 1; |
| 128 | |
| 129 | return i386_thiscall_push_dummy_call (gdbarch, function, regcache, bp_addr, |
| 130 | nargs, args, sp, return_method, |
| 131 | struct_addr, thiscall); |
| 132 | } |
| 133 | |
| 134 | /* Common parts for gdbarch initialization for Windows and Cygwin on i386. */ |
| 135 | |
| 136 | static void |
| 137 | i386_windows_init_abi_common (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 138 | { |
| 139 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 140 | |
| 141 | set_gdbarch_skip_trampoline_code (gdbarch, i386_windows_skip_trampoline_code); |
| 142 | |
| 143 | set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue); |
| 144 | |
| 145 | tdep->struct_return = reg_struct_return; |
| 146 | |
| 147 | tdep->gregset_reg_offset = i386_windows_gregset_reg_offset; |
| 148 | tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset); |
| 149 | tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET; |
| 150 | |
| 151 | tdep->sizeof_fpregset = 0; |
| 152 | |
| 153 | /* Core file support. */ |
| 154 | set_gdbarch_core_xfer_shared_libraries |
| 155 | (gdbarch, windows_core_xfer_shared_libraries); |
| 156 | set_gdbarch_core_pid_to_str (gdbarch, windows_core_pid_to_str); |
| 157 | |
| 158 | set_gdbarch_auto_wide_charset (gdbarch, i386_windows_auto_wide_charset); |
| 159 | } |
| 160 | |
| 161 | /* gdbarch initialization for Windows on i386. */ |
| 162 | |
| 163 | static void |
| 164 | i386_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 165 | { |
| 166 | i386_windows_init_abi_common (info, gdbarch); |
| 167 | windows_init_abi (info, gdbarch); |
| 168 | |
| 169 | set_gdbarch_push_dummy_call (gdbarch, i386_windows_push_dummy_call); |
| 170 | } |
| 171 | |
| 172 | /* gdbarch initialization for Cygwin on i386. */ |
| 173 | |
| 174 | static void |
| 175 | i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 176 | { |
| 177 | i386_windows_init_abi_common (info, gdbarch); |
| 178 | cygwin_init_abi (info, gdbarch); |
| 179 | } |
| 180 | |
| 181 | static gdb_osabi |
| 182 | i386_windows_osabi_sniffer (bfd *abfd) |
| 183 | { |
| 184 | const char *target_name = bfd_get_target (abfd); |
| 185 | |
| 186 | if (!streq (target_name, "pei-i386")) |
| 187 | return GDB_OSABI_UNKNOWN; |
| 188 | |
| 189 | if (is_linked_with_cygwin_dll (abfd)) |
| 190 | return GDB_OSABI_CYGWIN; |
| 191 | |
| 192 | return GDB_OSABI_WINDOWS; |
| 193 | } |
| 194 | |
| 195 | static enum gdb_osabi |
| 196 | i386_cygwin_core_osabi_sniffer (bfd *abfd) |
| 197 | { |
| 198 | const char *target_name = bfd_get_target (abfd); |
| 199 | |
| 200 | /* Cygwin uses elf core dumps. Do not claim all ELF executables, |
| 201 | check whether there is a .reg section of proper size. */ |
| 202 | if (strcmp (target_name, "elf32-i386") == 0) |
| 203 | { |
| 204 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
| 205 | if (section != nullptr |
| 206 | && bfd_section_size (section) == I386_WINDOWS_SIZEOF_GREGSET) |
| 207 | return GDB_OSABI_CYGWIN; |
| 208 | } |
| 209 | |
| 210 | return GDB_OSABI_UNKNOWN; |
| 211 | } |
| 212 | |
| 213 | void _initialize_i386_windows_tdep (); |
| 214 | void |
| 215 | _initialize_i386_windows_tdep () |
| 216 | { |
| 217 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, |
| 218 | i386_windows_osabi_sniffer); |
| 219 | |
| 220 | /* Cygwin uses elf core dumps. */ |
| 221 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, |
| 222 | i386_cygwin_core_osabi_sniffer); |
| 223 | |
| 224 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_WINDOWS, |
| 225 | i386_windows_init_abi); |
| 226 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN, |
| 227 | i386_cygwin_init_abi); |
| 228 | } |